1/* libunwind - a platform-independent unwind library 2 Copyright (C) 2001-2003, 2005 Hewlett-Packard Co 3 Contributed by David Mosberger-Tang <davidm@hpl.hp.com> 4 5This file is part of libunwind. 6 7Permission is hereby granted, free of charge, to any person obtaining 8a copy of this software and associated documentation files (the 9"Software"), to deal in the Software without restriction, including 10without limitation the rights to use, copy, modify, merge, publish, 11distribute, sublicense, and/or sell copies of the Software, and to 12permit persons to whom the Software is furnished to do so, subject to 13the following conditions: 14 15The above copyright notice and this permission notice shall be 16included in all copies or substantial portions of the Software. 17 18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 21NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 22LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 24WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 25 26#include "init.h" 27#include "unwind_i.h" 28 29#ifdef UNW_REMOTE_ONLY 30 31PROTECTED int 32unw_init_local (unw_cursor_t *cursor, unw_context_t *uc) 33{ 34 return -UNW_EINVAL; 35} 36 37#else /* !UNW_REMOTE_ONLY */ 38 39static inline void 40set_as_arg (struct cursor *c, unw_context_t *uc) 41{ 42#if defined(__linux) && defined(__KERNEL__) 43 c->task = current; 44 c->as_arg = &uc->sw; 45#else 46 c->as_arg = uc; 47#endif 48} 49 50static inline int 51get_initial_stack_pointers (struct cursor *c, unw_context_t *uc, 52 unw_word_t *sp, unw_word_t *bsp) 53{ 54#if defined(__linux) 55 unw_word_t sol, bspstore; 56 57#ifdef __KERNEL__ 58 sol = (uc->sw.ar_pfs >> 7) & 0x7f; 59 bspstore = uc->sw.ar_bspstore; 60 *sp = uc->ksp; 61# else 62 sol = (uc->uc_mcontext.sc_ar_pfs >> 7) & 0x7f; 63 bspstore = uc->uc_mcontext.sc_ar_bsp; 64 *sp = uc->uc_mcontext.sc_gr[12]; 65# endif 66 *bsp = rse_skip_regs (bspstore, -sol); 67#elif defined(__hpux) 68 int ret; 69 70 if ((ret = ia64_get (c, IA64_REG_LOC (c, UNW_IA64_GR + 12), sp)) < 0 71 || (ret = ia64_get (c, IA64_REG_LOC (c, UNW_IA64_AR_BSP), bsp)) < 0) 72 return ret; 73#else 74# error Fix me. 75#endif 76 return 0; 77} 78 79PROTECTED int 80unw_init_local (unw_cursor_t *cursor, unw_context_t *uc) 81{ 82 struct cursor *c = (struct cursor *) cursor; 83 unw_word_t sp, bsp; 84 int ret; 85 86 if (!tdep_init_done) 87 tdep_init (); 88 89 Debug (1, "(cursor=%p)\n", c); 90 91 c->as = unw_local_addr_space; 92 set_as_arg (c, uc); 93 94 if ((ret = get_initial_stack_pointers (c, uc, &sp, &bsp)) < 0) 95 return ret; 96 97 Debug (4, "initial bsp=%lx, sp=%lx\n", bsp, sp); 98 99 if ((ret = common_init (c, sp, bsp)) < 0) 100 return ret; 101 102#ifdef __hpux 103 /* On HP-UX, the context created by getcontext() points to the 104 getcontext() system call stub. Step over it: */ 105 ret = unw_step (cursor); 106#endif 107 return ret; 108} 109 110#endif /* !UNW_REMOTE_ONLY */ 111